Leonard Brzezinski'sart studio has been established in 1920 by his father Michael in a small town Szamotuly located in the western part of Poland. Michael Brzezinski was operating his architectural glass and stained glass studio until 1950s. His creations were presented in many exhibits and international fairs. His art has been awarded medal prizes and recognitions.

Leonard Brzezinski started his education under his father's supervision. Then he graduated from Fine Art State High School in Poznan and then went on to study fine art at the Nicolaus Copernicus University in Torun. He defended his M.S. fine arts degree in 1956 and has joined the conservation studio in Torun lead by Edward Kwiatkowski. In 1958, he took over the studio from his father in Szamotuly.

As an artist, Leonard Brzezinski is focusing on graphics and painting. He has authored a wide range of liturgical, public and private works.

His most important creations are stained glas windows developed for St. Michael cathedral in Elblag, large scale windows in Sochaczew,Warsaw, Pila, Polczyn-Zdroj, Kolo, Stawiszyn, Godziszow, Lublin, Katy, Czchow and Wegorzewo.

Since 1956, he is a member of the Polish Artist Association. He has received a prize for his contibutions to the development of the Wielkopolska voivodship.